Nazi spies use a stolen shortwave transmitter prototype to broadcast top secret shipping info to an offshore Japanese sub. To nab the spy ring, the Government has the West Coast's top radio engineers fired and shadowed to see if the Nazis recruit them to complete work on the prototype radio. Radio engineer Lew Deerhold, a resident alien without a job to pay for his adorable little ward Gina's life-saving operation, falls prey to the spy ring, and is swept up in a maelstrom of deceit and danger.

Richard Arlen
as Lewis J. 'Lee' Deerhold

Wendy Barrie
as Ann Patterson

Nils Asther
as Dr. Arthur Huneker

Roger Pryor
as G.B. Fleming

Abner Biberman
as Commander Toyo

Marc Lawrence
as Vincent Bela

John Miljan
as Mr. Bambridge / Capt. Haigas

Patsy Nash
as Tina Deerhold

Ralph Sanford
as Agent Freddie Grayson

Jack Carr
as Old Mill Gate Guard
CinemaSerf
The title of this is a little misleading - it hasn't really got anything much to do with submarines. It's more an espionage thriller that sees some Nazi spies pinch a prototype shortwave radio transmitter that enables them to report shipping movements to an Axis submarine which then picks them off. ...